GeForce GTX 660M Mac Edition and Radeon HD 6970M Mac Edition - video card comparison
GeForce GTX 660M Mac Edition
Radeon HD 6970M Mac Edition
Architecture
Kepler (2012−2018)
TeraScale 2 (2009−2015)
GPU code name
GK107
Blackcomb
Market segment
Desktop
Desktop
Release date
April 2013
August 2011
Interface
MXM-B (3.0)
MXM-B (3.0)
Supplementary power connectors
None
None
Core clock speed
950 MHz
680 MHz
Floating-point performance
729.6 gflops
1,305.6 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
1,270 million
1,700 million
Pipelines / CUDA cores
384
960
Power consumption (TDP)
50 Watt
75 Watt
Texture fill rate
30.40
32.64
Memory type
GDDR5
GDDR5
Maximum RAM amount
512 MB
2 GB
Memory bus width
128 Bit
256 Bit
Memory clock speed
5000 MHz
3600 MHz
Memory bandwidth
80 GB/s
115.2 GB/s
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
11.2 (11_0)
CUDA
3.0
-
OpenCL
1.2
1.2
OpenGL
4.6
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
N/A